Miley: It's safe to say that Bynes will not be downloading Cyrus's new single, "We Can't Stop." In fact, she apparently can't stand her. Two weeks after Bynes tweeted about how "gorgeous" Cyrus's on-again/off-again fiancé, Liam Hemsworth, is (they reportedly hooked up in 2009 before he met Cyrus on the set of "The Last Song"), she again took to the social media site to blast the singer. "UR ugly," the “Hairspray” star tweeted to Cyrus twice on Tuesday night and Wednesday morning, the latter time attaching a photo of the former "Hannah Montana" star in a diamond jumpsuit at the Billboard Music Awards. Bynes's catty comment received over 8,000 retweets and 5,000 favorites in a matter of hours.

On Wednesday, Cyrus responded to Bynes's insult during an interview with D.C.'s radio station Hot 95.5, saying, "I won't even entertain that thought. I think it's all so sad and I don't want to add any fuel to that fire. It's really so sad to me. I was rooting for her comeback until [she] started attacking me."